package pack0619;

public class DemoI {
    public static void main(String[] args){
        int n=10;
        for (int i=1;i<=n;i++){
            for (int k=n-1;k>=i;k--){
               System.out.print("");
           }
           for (int j=1;j<=2*i-1;j++);{
        System.out.print("*");
    }
    System.out.println();}
        for (int i=n+1;i>=1;i--){
            for (int k=1;k<=n-1;k++){
            System.out.print("");
            }
            for (int j=1;j<=2*i-1;j++){
                System.out.print("*");
            }
            System.out.println();
        }
        }

}
